What is the meaning of silent?

adjective

• Marked by absence of sound.
  • usage: "a silent house"; "soundless footsteps on the grass"; "the night was still"
  • synonyms: soundless, still
• Failing to speak or communicate etc when expected to.
  • usage: "the witness remained silent"
  • synonyms: mum
• Implied by or inferred from actions or statements.
  • usage: "gave silent consent"; "a tacit agreement"; "the understood provisos of a custody agreement"
  • synonyms: tacit, understood
• Not made to sound.
  • usage: "the silent `h' at the beginning of `honor'"; "in French certain letters are often unsounded"
  • synonyms: unsounded
• Having a frequency below or above the range of human audibility.
  • usage: "a silent dog whistle"
• Unable to speak because of hereditary deafness.
  • synonyms: dumb, mute